KYORITSU 2413R - Manual (Page 15)

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Note ：When measuring large current, observe the time limit specified in
section 3, Specifications. Otherwise, the transformers jaws may
overheat, resulting in damage to the instrument.
It may take several tens of seconds to indicate exact zero, but
this is normal.
Even if current is being applied to the instrument till zero is
indicated on the LCD, it doesn't affect the readings.
Fig.3 Normal AC Current
Measurements
F ig.4 Earth Leakage Current
Measurements
Single-Phase 2-wire system
(in 3-wire system with neutral
clamp onto all 3 wire)
3-phase 3-wire system.
(in 4-wire system with neutral
clamp onto all 4 wire)
Fig.5 Measurements out of balance Leakage